clabiugh



. 2Sheets-Shet 1. A. ULABAUGH' 81; M. B. MCDOWELL.

(ModeL) FURNACE.

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Patented Mar. 21. 18 82.

m 2- I E W W 5 WITNESSES I .dttameys (ModeL) v 2Sheets-Sheet 2. A. CLABAUGH 85 M. B. MGDOWELL.

FURNACE.

No. 255,253. Patented Mar. 21,1882. 2e.

WITNESSES 1N VEJV' T0186 I AM 1 x v fl t'torneys NITED {TENT FFICE.

FURNAC E.

SPECIFICATION forming part of Letters Patent No. 255,253, dated'march 21, 1882,

others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Figure 1 is a perspective view of our im proved heater or furnace, parts of the wall bein g broken away in order to show the construction. Fig. 2 is a longitudinal vertical sectional.

view. Fig. 3 is a vertical cross-section. Fig. 4 is a horizontal sectional view taken through the radiators; and Fig. 5 is a detail view, illustrating the removable fire-brick front of the furnace. 7

Corresponding parts in the several figures are denoted by like letters of reference.

This invention relates to hot-air furnaces or heaters and it consists in certain improvements in the construction of the same, which will be hereinafter fully described, and particularly pointed out in the claim.

In the drawings hereto annexed, A represents the furnace, which rests upon a bed, B, of masonry, and is surrounded by awall, arch,

'or casing, G, constructed in the usual manner,

preferably of brick-work. The furnace is provided in front of the'grate-bars with an opening, D, extending to the door-frame, and covered by a flat block or tile, E, of fire-brick, which is supported upon side flanges, 'F, and a transverse cross-bar, G. The said block E is provided with a handle, H, so as to be readily slid out through the door-opening, and it is, while the furnace is in use, retained in position by pivoted latchesl. By this arrangement of the block E clinkers and other obstructions may be readily removed from the gratebars without removing the latter from the furnace, it being only necessary to take out the said block, rake the obstructionsdowu through opening D into the ash-pit and replace the block, all dust and dirt being thus confined Application filed July 30, .1881.- (Model) within the furnace and ash-pit, and much trouble avoided.

J is a radiator, consisting of a fiat box or casing arranged'horizontally above the furnace, and having an opening, K, surrounded by a collar, L, connected with the smoke-flue of the furnace. Arranged in the radiator is a.

semi-partition, M, which causes the products d of combustion to travel toward the front of the furnace and again back in the direction indicated by the arrows. From the radiator J theproducts of combustion passinto asecond radiator, N, arranged vertically behind the furnace, and having a semi-partition, O, which causes the products of combustion to travel.

first down, then up and out through theflue P to the chimney, as indicated byarrows. The

radiator N is provided near its lower end with an opening, Q, to enable it to be cleanedout when necessary. The radiator J has at its front end an opening, R, surrounded by a collar, S, which extends out through the wall or casing G. The latter has another opening, T, in which is fitted one end of a U-shapedpipe or knee, U, the other end of which is connected with the collar S ofthe radiator. The pipeU has acentrally-located damper, V.

Suitable provision is made for conveying the F hot air from casing C to the registers.

In operation cold air is admitted through suitable openings atthe bottom of thecasing. By contact with the body of the furnace it is partly heated and caused to ascend, so as to hereheated or superheated-by. the radiators. The damper V meanwhile remains closed. Should the heat become too great, the damper V is opened, thus permitting the hot air to escape with the smoke through the radiators, the effect of which is twofold, viz: first, to prevent -the accumulation of hot air within the casing,

such as .would be the case were the registers simply closed, to the detriment of the furnace, which would thus much sooner be burned out; second, the draft through the grate is checked, and the fire thus reduced until it is found desirable to close the damper again.

Having thus described our invention, we claim and desire to secure by Letters Patent of the United States- In a hot-aii furnace constructed substanour own we have hereto affixed our signatures tially as described, the combination of the'casin presence of two witnesses. ing 0, the furnace, and the radiators N J, the ANDREW CLABAUGEL latter of which is connected by apipe, U, hav- 1 1 5 ing damper V, with the inside of the casing, MHJHAEL BROWN Mano as described, for the purpose shown and speci- Witnesses: fied. WILBUR B. BLAKE, In testimony that we claim the foregoing as F. H. NIGEWONGER. 

